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Soft RAID would typically be below the LVM layer. Technically you can create the soft RAID on top, but depending on how the template configures LVM it's likely to be a bad/unsafe option.
Try running
to list the physical disk configuration and
to list any "volume groups" which may consist of one or more physical disks.
You are kind of limited on your install template options with WSI. The best I've been able to get it to automagically do is setup SW RAID; I never got anything LVM working. Subscribed to thread.
Technically LVM can create raid LV-s by itself, from lvcreate manpage:
But to be honest i never tried something other than mirror. Used mirror to online-migrate LV between PV-s.
Also, if everything is installed on one HDD, no matter with LVM or not, it is possible to create mdraid with one missing device using remaining drives, migrate OS there, boot from it and rebuild to old OS drive.
Show lsblk output, it is hard to give any advice without knowing how it is currently configured.